diff --git a/readme.md b/readme.md
index 2cefd3fd..6ddded2b 100644
--- a/readme.md
+++ b/readme.md
@@ -72,6 +72,7 @@ glm::mat4 camera(float Translate, glm::vec2 const& Rotate)
 - Fixed ortho #790
 - Fixed Visual C++ 2013 warnings in vector relational code #782
 - Fixed ICC build errors with constexpr #704
+- Fixed defaulted operator= and constructors #791
 
 ### [GLM 0.9.9.0](https://github.com/g-truc/glm/releases/tag/0.9.9.0) - 2018-05-22
 #### Features:
diff --git a/test/core/CMakeLists.txt b/test/core/CMakeLists.txt
index 13477a97..12d76bf3 100644
--- a/test/core/CMakeLists.txt
+++ b/test/core/CMakeLists.txt
@@ -1,3 +1,4 @@
+glmCreateTestGTC(core_cpp_defaulted_ctor)
 glmCreateTestGTC(core_force_aligned_gentypes)
 glmCreateTestGTC(core_force_ctor_init)
 glmCreateTestGTC(core_force_explicit_ctor)
diff --git a/test/core/core_cpp_defaulted_ctor.cpp b/test/core/core_cpp_defaulted_ctor.cpp
new file mode 100644
index 00000000..ea927d12
--- /dev/null
+++ b/test/core/core_cpp_defaulted_ctor.cpp
@@ -0,0 +1,144 @@
+#include <glm/glm.hpp>
+
+#if GLM_USE_DEFAULTED_FUNCTIONS == GLM_ENABLE
+
+#include <glm/gtc/constants.hpp>
+#include <glm/gtc/quaternion.hpp>
+#include <glm/ext/vector_relational.hpp>
+#include <glm/ext/vec1.hpp>
+#include <cstring>
+
+static int test_vec_memcpy()
+{
+	int Error = 0;
+
+	{
+		glm::ivec1 const A = glm::ivec1(76);
+		glm::ivec1 B;
+		std::memcpy(&B, &A, sizeof(glm::ivec1));
+		Error += B == A ? 0 : 1;
+	}
+
+	{
+		glm::ivec2 const A = glm::ivec2(76);
+		glm::ivec2 B;
+		std::memcpy(&B, &A, sizeof(glm::ivec2));
+		Error += B == A ? 0 : 1;
+	}
+
+	{
+		glm::ivec3 const A = glm::ivec3(76);
+		glm::ivec3 B;
+		std::memcpy(&B, &A, sizeof(glm::ivec3));
+		Error += B == A ? 0 : 1;
+	}
+
+	{
+		glm::ivec4 const A = glm::ivec4(76);
+		glm::ivec4 B;
+		std::memcpy(&B, &A, sizeof(glm::ivec4));
+		Error += B == A ? 0 : 1;
+	}
+
+	return Error;
+}
+
+static int test_mat_memcpy()
+{
+	int Error = 0;
+
+	{
+		glm::mat2x2 const A = glm::mat2x2(76);
+		glm::mat2x2 B;
+		std::memcpy(&B, &A, sizeof(glm::mat2x2));
+		Error += glm::all(glm::equal(B, A, glm::epsilon<float>())) ? 0 : 1;
+	}
+
+	{
+		glm::mat2x3 const A = glm::mat2x3(76);
+		glm::mat2x3 B;
+		std::memcpy(&B, &A, sizeof(glm::mat2x3));
+		Error += glm::all(glm::equal(B, A, glm::epsilon<float>())) ? 0 : 1;
+	}
+
+	{
+		glm::mat2x4 const A = glm::mat2x4(76);
+		glm::mat2x4 B;
+		std::memcpy(&B, &A, sizeof(glm::mat2x4));
+		Error += glm::all(glm::equal(B, A, glm::epsilon<float>())) ? 0 : 1;
+	}
+
+	{
+		glm::mat3x2 const A = glm::mat3x2(76);
+		glm::mat3x2 B;
+		std::memcpy(&B, &A, sizeof(glm::mat3x2));
+		Error += glm::all(glm::equal(B, A, glm::epsilon<float>())) ? 0 : 1;
+	}
+
+	{
+		glm::mat3x3 const A = glm::mat3x3(76);
+		glm::mat3x3 B;
+		std::memcpy(&B, &A, sizeof(glm::mat3x3));
+		Error += glm::all(glm::equal(B, A, glm::epsilon<float>())) ? 0 : 1;
+	}
+
+	{
+		glm::mat3x4 const A = glm::mat3x4(76);
+		glm::mat3x4 B;
+		std::memcpy(&B, &A, sizeof(glm::mat3x4));
+		Error += glm::all(glm::equal(B, A, glm::epsilon<float>())) ? 0 : 1;
+	}
+
+	{
+		glm::mat4x2 const A = glm::mat4x2(76);
+		glm::mat4x2 B;
+		std::memcpy(&B, &A, sizeof(glm::mat4x2));
+		Error += glm::all(glm::equal(B, A, glm::epsilon<float>())) ? 0 : 1;
+	}
+
+	{
+		glm::mat4x3 const A = glm::mat4x3(76);
+		glm::mat4x3 B;
+		std::memcpy(&B, &A, sizeof(glm::mat4x3));
+		Error += glm::all(glm::equal(B, A, glm::epsilon<float>())) ? 0 : 1;
+	}
+
+	{
+		glm::mat4x4 const A = glm::mat4x4(76);
+		glm::mat4x4 B;
+		std::memcpy(&B, &A, sizeof(glm::mat4x4));
+		Error += glm::all(glm::equal(B, A, glm::epsilon<float>())) ? 0 : 1;
+	}
+
+	return Error;
+}
+
+static int test_quat_memcpy()
+{
+	int Error = 0;
+
+	{
+		glm::quat const A = glm::quat(1, 0, 0, 0);
+		glm::quat B;
+		std::memcpy(&B, &A, sizeof(glm::quat));
+		Error += B == A ? 0 : 1;
+	}
+
+	return Error;
+}
+
+#endif//GLM_USE_DEFAULTED_FUNCTIONS == GLM_ENABLE
+
+int main()
+{
+	int Error = 0;
+
+#	if GLM_USE_DEFAULTED_FUNCTIONS == GLM_ENABLE
+		Error += test_vec_memcpy();
+		Error += test_mat_memcpy();
+		Error += test_quat_memcpy();
+#	endif//GLM_USE_DEFAULTED_FUNCTIONS == GLM_ENABLE
+
+	return Error;
+}
+